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CRCT Question. What kind of weather is associated when a cold front approaches an area? sunny skies drizzly rain thunderstorms, heavy rain, or snow hot, muggy weather. Agree or Disagree . The universe is about 13.7 million years old The milky way is a spiral galaxy

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Crct question

CRCT Question

What kind of weather is associated when a cold front approaches an area?

sunny skies

drizzly rain

thunderstorms, heavy rain, or snow

hot, muggy weather


Agree or disagree
Agree or Disagree

  • The universe is about 13.7 million years old

  • The milky way is a spiral galaxy

  • Stars are classified according to age, picture, temperature

  • Blue-white stars are the hottest

  • Astronomers believe that the universe is expanding

  • We use radiation as evidence that the galaxies are moving apart

  • Salinity of the ocean is approximately 35%


Are stars still present in the sky during the day time?

  • Yes, we just can’t see them because their dim light is overwhelmed by the brightness of the sun during the day.


Galaxies are based on their

0

Galaxies are based on their:

  • Size

  • Shape

  • Brightness

  • Density

    What is it most based on?


Life Cycle

Of

Stars

Video


viI. How a star is born?


A nebulas

As the particles pull closer together the temperature increases.

At 10,000,000o C fusion takes place and energy radiates outward through the condensing ball of gas.

Another view of Orion

A. Nebulas


B hydrogen fusion energy of the stars
B. Hydrogen increases.Fusion: Energy of the Stars

  • Stars have large amounts of hydrogen gas.

  • 4 hydrogenatoms fuse forming 1 atom of helium

  • The mass of 4 hydrogen atoms is greater than the mass of 1 helium atom; the excess mass is converted to a tremendous amount of energy.


This hydrogen helium fusion can power a star for billions of years
This increases.hydrogen  helium fusion can power a star for billions of years


C red giant

Fusion increases. uses up a star’s hydrogen supply rapidly casing the core to heat up and the outer temperature to fall. (Life cycle of the star)

Star expands and becomes a red giant

Red Giant

C. Red Giant


D stellar evolution

Core continues to heat and star expands to a increases.super giant.

As the core uses up its helium supply, the outer layers escape into space and the remaining core is white hot and called a white dwarf.

White dwarfs

D. Stellar Evolution


E stellar evolution

When no more material is left in the core it explodes into a supernova.

Smaller stars become neutron stars and most massive will collapse into a black hole.

Neutron Star

E. Stellar Evolution



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